.site-header {
  position: sticky;
  top: 0;
  z-index: 60;
  backdrop-filter: blur(14px);
  background: rgba(246, 252, 255, 0.86);
  border-bottom: 1px solid rgba(15, 67, 103, 0.16);
  box-shadow: 0 16px 34px rgba(7, 36, 58, 0.1);
}

body[data-nav-menu-open="true"] {
  overflow: hidden;
  touch-action: none;
}

.header-shell {
  display: flex;
  align-items: center;
  justify-content: space-between;
  gap: 1rem;
  padding: 0.78rem 0;
}

.brand {
  display: inline-flex;
  align-items: center;
  gap: 0.74rem;
  min-width: 0;
}

.brand-mark {
  border-radius: 14px;
  background: linear-gradient(120deg, rgba(88, 216, 216, 0.22), rgba(255, 179, 75, 0.22));
  padding: 0.14rem;
}

.brand-text {
  display: grid;
  gap: 0.08rem;
  min-width: 0;
}

.brand-name {
  font-family: var(--font-display);
  font-weight: 700;
  letter-spacing: 0.02em;
  color: var(--night-900);
}

.brand-tagline {
  color: var(--text-muted);
  font-size: 0.73rem;
  line-height: 1.2;
}

.header-nav-cluster {
  display: flex;
  align-items: center;
  gap: 0.72rem;
  position: relative;
  z-index: 5;
}

.header-auth-cluster {
  display: inline-flex;
  align-items: center;
  gap: 0.5rem;
}

.header-user-chip {
  display: none;
  border: 1px solid rgba(15, 67, 103, 0.26);
  border-radius: var(--radius-pill);
  padding: 0.34rem 0.72rem;
  background: rgba(255, 255, 255, 0.86);
  color: var(--ocean-700);
  font-size: 0.76rem;
  font-weight: 700;
  letter-spacing: 0.01em;
  max-width: 280px;
  white-space: nowrap;
  overflow: hidden;
  text-overflow: ellipsis;
}

.mega-nav {
  position: relative;
  z-index: 61;
}

.mega-nav-trigger {
  cursor: pointer;
  border-radius: var(--radius-pill);
  border: 1px solid var(--border-strong);
  background: rgba(255, 255, 255, 0.8);
  color: var(--night-900);
  padding: 0.48rem 0.95rem;
  font-family: var(--font-display);
  font-weight: 700;
}

.mega-nav-trigger.has-active-route {
  border-color: rgba(15, 126, 170, 0.52);
  background: rgba(236, 252, 255, 0.94);
}

.mega-nav-trigger:hover {
  border-color: rgba(15, 67, 103, 0.45);
}

.mega-nav-trigger__icon {
  display: inline-block;
  width: 11px;
  height: 11px;
  border-right: 2px solid var(--ocean-700);
  border-bottom: 2px solid var(--ocean-700);
  transform: rotate(45deg);
  margin-left: 0.56rem;
  margin-bottom: 0.14rem;
  transition: transform 0.22s ease;
}

.mega-nav.is-open .mega-nav-trigger__icon {
  transform: rotate(-135deg);
  margin-bottom: 0;
}

.mega-nav-panel {
  position: absolute;
  right: 0;
  top: 3rem;
  width: min(980px, 92vw);
  border-radius: var(--radius-lg);
  border: 1px solid var(--border-soft);
  background:
    radial-gradient(circle at 88% 10%, rgba(255, 179, 75, 0.15), transparent 34%),
    radial-gradient(circle at 10% 80%, rgba(88, 216, 216, 0.14), transparent 30%),
    rgba(255, 255, 255, 0.96);
  box-shadow: var(--shadow-soft);
  padding: 1rem;
  z-index: 62;
}

.mega-nav-grid {
  display: grid;
  grid-template-columns: repeat(4, minmax(0, 1fr));
  gap: 0.9rem;
}

.mega-nav-column {
  display: flex;
  flex-direction: column;
  gap: 0.4rem;
  min-width: 0;
}

.mega-nav-heading {
  margin: 0 0 0.25rem;
  text-transform: uppercase;
  letter-spacing: 0.17em;
  font-size: 0.66rem;
  color: var(--text-muted);
  font-weight: 700;
}

.mega-nav-link {
  display: inline-flex;
  align-items: center;
  width: fit-content;
  padding: 0.24rem 0.42rem;
  margin-left: -0.42rem;
  border-radius: 10px;
  color: var(--night-900);
  font-weight: 700;
  font-size: 0.91rem;
  line-height: 1.34;
  border: 1px solid transparent;
  transition: background 0.2s ease, border-color 0.2s ease, color 0.2s ease;
}

.mega-nav-link:hover {
  background: rgba(15, 126, 170, 0.08);
  border-color: rgba(15, 126, 170, 0.22);
  text-decoration: none;
}

.mega-nav-link.is-active {
  background: linear-gradient(120deg, rgba(40, 196, 201, 0.22), rgba(255, 179, 75, 0.16));
  border-color: rgba(15, 126, 170, 0.3);
  color: var(--night-950);
  text-decoration: none;
}

.mega-nav-footer {
  margin-top: 0.92rem;
  padding-top: 0.86rem;
  border-top: 1px solid rgba(15, 67, 103, 0.14);
  display: flex;
  flex-wrap: wrap;
  gap: 0.5rem;
}

.mega-chip {
  border: 1px solid var(--border-soft);
  border-radius: var(--radius-pill);
  padding: 0.3rem 0.72rem;
  background: rgba(255, 255, 255, 0.86);
  font-size: 0.76rem;
  font-weight: 700;
  color: var(--ocean-700);
}

.mega-nav-backdrop {
  position: fixed;
  inset: 0;
  border: 0;
  padding: 0;
  margin: 0;
  background: transparent;
  cursor: default;
  z-index: 58;
}

.header-cta {
  display: none;
}

@media (min-width: 980px) {
  .header-cta {
    display: inline-flex;
  }
}

@media (min-width: 1220px) {
  .header-user-chip {
    display: inline-flex;
  }
}

@media (max-width: 979px) {
  .header-shell {
    flex-wrap: wrap;
    align-items: stretch;
  }

  .brand {
    flex: 1;
  }

  .brand-tagline {
    display: none;
  }

  .header-nav-cluster {
    width: 100%;
    justify-content: space-between;
  }

  .mega-nav {
    flex: 1;
  }

  .mega-nav-panel {
    position: static;
    width: 100%;
    margin-top: 0.6rem;
  }

  .mega-nav-grid {
    grid-template-columns: repeat(2, minmax(0, 1fr));
  }
}

@media (max-width: 640px) {
  .mega-nav-grid {
    grid-template-columns: 1fr;
  }

  .mega-nav-link {
    font-size: 0.93rem;
  }
}